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Feedforward Control of Plant Nitrate Transporter NRT1.1 Biphasic Adaptive Activity
Mubasher Rashid1, Soumen Bera1, Malay Banerjee2
1School of Mathematics, Statistics and Computational Sciences, Central University of Rajasthan, Bandarsindri, Ajmer, India.
Biophysical Journal
|November 9, 2019
Summary
Plant nitrate transporter NRT1.1 acts as a sensor, regulating nitrogen metabolism. Its dimeric or monomeric state, controlled by phosphorylation, determines high or low nitrate affinity, crucial for plant adaptation.
Area of Science:
- Plant Biology
- Molecular Plant Physiology
- Biochemistry
Background:
- Nitrate signaling is vital for plant nitrogen metabolism and nutrient uptake.
- The nitrate transceptor NRT1.1 plays a key role in sensing and transporting nitrate.
- Understanding NRT1.1's regulatory mechanism is crucial for improving plant nitrogen use efficiency.
Purpose of the Study:
- To elucidate the adaptive responses and regulation of NRT1.1-mediated nitrate signaling across varying nitrate concentrations.
- To investigate the molecular mechanisms underlying NRT1.1's dual high- and low-affinity transport modes.
Main Methods:
- Investigated NRT1.1 structure-function relationships in response to nitrate levels.
- Analyzed the role of calcium signaling (CBL9) and kinase activity (CIPK23) in NRT1.1 regulation.
- Utilized biochemical assays to study NRT1.1 dimerization, decoupling, and phosphorylation.
Main Results:
- NRT1.1's homodimeric structure and dimeric switch are critical for nitrate signaling.
- Low nitrate concentration triggers calcium waves and CIPK23 activation, leading to NRT1.1 phosphorylation and high-affinity transport.
- High nitrate concentration maintains NRT1.1 dimerization and low-affinity transport, attenuating CIPK23 activity.
- Phosphorylation-dependent NRT1.1 modulation exhibits bistable behavior regulated by an incoherent feedforward loop.
Conclusions:
- NRT1.1 functions as a nitrate transceptor whose activity is modulated by phosphorylation, enabling adaptation to fluctuating nitrate availability.
- The study provides a detailed molecular understanding of nitrate signaling and transport in plants.
- Findings offer potential strategies for enhancing plant nitrogen use efficiency in agriculture.
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